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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-Of 00 <br /> Analytical 1455 McDowell Blvd North Ste D Peraluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Farmer Property 62596 0001-01 <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey QC Sample Group 9809G78-04 Reported Oct 5, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst GR <br /> ANALYTE Gasoline <br /> QC Batch# GCO92998BTEX30A <br /> Sample No GW98091`07-2 <br /> Date Prepared 9129198 <br /> Date Analyzed 9129198 <br /> Instrument I D# GCHP30 <br /> Sample Conc , uglL N D <br /> Conc Spiked, uglL 250 <br /> Matrix Spike, ug1L 260 <br /> • % Recovery 102 <br /> Matrix <br /> Spike Duplicate, uglL 260 <br /> % Recovery 103 <br /> Relative % Difference 098 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWLCS092998A <br /> Date Prepared 9129198 <br /> Date Analyzed 9129198 <br /> Instrument I D# GCHP30 <br /> Conc Spiked, uglL 250 <br /> LCS Recovery ug1L 250 <br /> LCS % Recovery 102 <br /> Percent Recovery Control Limits <br /> MSlM$D 60140 <br /> LCS 70 130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> . SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Kjm <br /> Project M ager <br />